IGN has announed today that Book 3 of The Legend of Korra will premiere next Friday, 27 June 2014 at 7pm ET on Nickelodeon.

Quoting from IGN (bold mine for emphasis):

"Yes, The Legend of Korra Book Three: Change will debut on Friday, June 27th at 7pm on Nickelodeon. You'll get a ton of Korra that night, as the first two episodes of Book Three air from 7pm-8pm ET/PT, followed by a special bonus presentation of the third episode of Book Three, 'The Earth Queen', at 8pm.

There will then be a break for the Fourth of July holiday, before new episodes resume in the show's regular timeslot, Fridays at 8pm, beginning July 11th."

So there you have it, everyone. Next Friday, June 27, tune into Nickelodeon at 7pm for the premiere of Book 3, then tune in again every Friday at 8pm starting on July 11th to watch the rest of the season.

The article also includes a short clip from the season premiere, as well as the titles and descriptions of the first two episodes.

Only one week to go!!!

UPDATE: Another preview clip appears in the Nickelodeon website (region-locked).